Installing the repair hacked wordpress site Scan plugin alert you to anything that you might have missed, and will check all this for you. Additionally, it will tell you that a user named"admin" exists. Needless to say, that is the user name. You find instructions if you desire and can follow a link. I personally think that there is a strong password good security, and there have been no successful attacks on the several blogs that I run since I followed those steps.
There are many ways to pull this off, and many of them involve re-establishing databases and more and FTPing files, exporting and copying. Some of them are very complex, so it is important that you go for the right one. Then you may want to look into using a plugin for WordPress backups if you are not of the technical persuasion.
I don't think there is a person out there that after learning just how much of a problem WordPress hacking is that it is a fantastic idea to enhance the safety of their blogs. However, something I've noticed over the years is that when it comes to securing their sites, bloggers seem to be stuck in this state that is reactive.
Along with adding a secret key to your wp-config.php document, also consider changing your user password into something that's strong and unique. A great idea is to avoid common phrases, use upper and lowercase letters, and include amounts, although wordPress will let you know the strength of your password. It's also a good idea to change your password regularly - say try this once every six months.
Change your password, or at least admin username and your WordPress password and collect and use good WordPress safety tips to keep hackers out!